Electric heater.



R.t L.. HMLEY. 'ELECTRIC HBTBB.' APPLIOVATIQN 1111.111 11111211.1903. l

Patented Apr; 6, 19%.

2 SHEETS-SHEET 1.

WITNESSES R.. L.,HAILEY.

ELECTRIC HEATER.

APPLIGATIOH lrILBD JUNE 11,1903

2 SHEETS-SHEET 2.

Patented Apr. 6, 1909 Y WITNESSES:

ATTMI Y S' onirico sfrnpppslnjigunir onirica'.

ROBERT LEE HAILEY,

OF NEW YORK, N. Y., ASSIGNOR lO THE LOWE ELEGTRlO GO., OF NEW YORK, N. Y., I'OORPORATlON OF NEW YORK.

ELECTRIC MATER.

Application filed June 11,

' specification.

ll/ly ,invention relates to improvements in electric .heaters and more particularly to such'a/pparatus as embodied 1n a smoothing ironfin which an electric current is caused to flow through high resistance material to heat the bottoni Aplate of the iron or other heat conducting and radiating surface.

The main object of my invention is to rapidly conduct the heat from the resistance material to the plate orI object to be heated and has for a` further object to simplify and cheapen the cost of construction of electric ally heated smoothing irons.

My invention consists in the novel parts, combinations of parts and details of construction hereinafter more particularly described and then specilied in the claims.

ln the accompanying drawings, Figure 1 is a side elevation of one form. of device having my invention applied thereto. Fig. 2 is a horizontal section taken on the line A, A

Fig'. 1.

Fig. 3 is a vertical-longitudinal secvtion through the device shown in Fig. 1.

Fig. et is a plan illustrating the preferredt manner of constructing the heat generating element detached from its attendant parts. Fig. 5 is a transverse vertical section taken on the line B. l. Fig. l. Fig. 6 is a plan and partial section of the device illustrated in Fig. l. Fig. 7 is a plan of a modified form of heating clement.

.ln the preferred adaptation of my invention as illustrated inthe accompanying drawings, l. `indicates a trough shaped body of metal having vertical side walls and a fiat plate 1"' forming the lottoni and. which constitutes the heat conducting or radiating element. 'lo the inner surface of this bottom plate is clamped or bolted the heat generating or resistance material as presently described. rl`he heat generating element proper consists preferably of a high resistance wire wound around a thin plate of mica 3 pref- 'vrably by threading it in slits in the edge 'of the mica plate when passing around the same and hy this construction the individual turns-oi' wire are prevented from coming in Specification of Lettere Patent.

' Patented April 6, 1909 190s. serial No. 437,820.

contact with each other and becoming shortcircuit-ed. (See Fig. 4.) A plate or sheet of thin mica 4 is placed upon the `bottom 1 of the body or trough 1 and upon Which the heating element consisting of the resistance wire 2 and mica plate 3 is placed. Superimposed upon the heating element is another thin sheet of mica 5 and on top of the plate 5 is a clamping plate 6 through which screws 7- pass and firmly fasten or clamp the plate 6 and intermediate layers to the heat radiating plate 1. Thus the resistance ma- `terial 2 is firmly clamped in close contact with the radiating plate 1', and the heat is readily conducted fi'om the Wire 2 to the plate 1 and radiates `to the atmosphere and thereby avoids excessive heating of the wires 2.

Instead of using the Wire 2 Wound around the mica plate for the heating element, a zigzag strip ofmetal or wire might be employed as illustrated in Fig. 7. This resistance'material 8 might 4be a strip of metal bent back and forth, or it might be stamped from a single plate of metal and is located and clamped in the heater between the mica.

plates 4 and 5. Terminal posts 9, 10 are mounted upon but insulated from a raised platform 11 secured to the plate 6 and each 4connected to one end of the resistance Inaterial by wires 12 and 13 and thus form the electrical circuit.. A'cover plate 14 provided with the usual handle 15 rising therefrom is secured to the body portion or heating chamber 1 and has preferably interposed between it and the Walls of the heating chamber a plate of relatively poor heat conducting material 16 such as asbestos. lt will be noted thaty the heating element by this construction is extremely small and thereby a large air space is left between the top of the same and the cover plate Which prevents the upper part of the iron becoming excessively hot. 'lhe terminal posts 9 and 1() pass up through enlarged openings 20 in the asbestos plate 16 and cover plate 15 the exposed ends being spindleshaped so that slip connectors 17. 18 may be readily attached and detached. be of any suitable form and are connected to the source of electrical supply by wires as usual in the art and are protected by an insulating thimble such as porcelain. When applied to the terminals, the porcelain thimble :is permitted to pass down through the The connectors might l Aid www, Sub wm'pnse desem rk 1n the (zonnig/H 

